Hollow percussion-drill.



No. 800,004. v PATEHETTED SEPT. 19, 1905..

J. MURPHY.v

HQLLQW' PERCUSSION DRILL APPLICATION FILED APB. 2'1, 1905,

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J. MURPHY.

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JEREMIAH MURPHY, OF LEADVILLE, COLORADO, ASSIGNOR TO CHARLES T. CARNAHAN, OF LEADVILLE, COLORADO.

HOLLOW PERCUSSION-DRILL.

Specification of Letters Patent.

Patented Sept. 19, 1905.

Application filed April 27, 1905. Serial No. 257,724.

To a whom, it may concern:

Be it known that I, JEREMIAH MURPHY, a citizen of the United States, residing at Leadville, in the county of Lake and State of U010- rado, have invented new and useful Improvements in Hollow Percussion-Drills, of which the following is a specification.

This invention relates to hollow percussiondrills for use in connection with pneumatic hammers particularly adapted for drilling openings in rock for blasting purposes in mining.

One of the objects of the invention is to provide a drill with a dust-allaying means adapted to prevent the inhaling of the dust by the operator and the flying back of the dust or fine particles of the rock into the operators face, which is very annoying and injurious.

\Vith the foregoing and other objects in View the invention consists of the novel construction of hollow percussion-drill hereinafter more specifically described, and illustrated in the accompanying drawings. which form a part of this specification, and particularly pointed out in the claims hereunto appended.

In the drawings, wherein like reference characters denote corresponding parts throughout the several views, Figure 1 is an elevation of the drill with the dust-allaying device removed. Figs. 1 and 1 are end views looking, respectively, toward the cutting and shank ends of the drill. Fig. 2 is a plan of an adjustable clamping-stop for the dust-arrester. Fig. 3 is a plan of the dust-arrester. Fig.4 is a longitudinal sectional view thereof. Fig. 5 is an elevation of a drill constructed in accordance with this invention and used for drilling downwardly in the rock, and Fig. 6 is a like view of the drill when used for drilling upwardly in the rock.

Referring to the drawings by reference characters, the drill is formed of a single piece or continuous bar of hammered close-grained steel having an axial bore 1 from end to end thereof. Although preferably the drill-body is constructed in a manner as stated-that is, from one continuous bar of hammered closegrained steel yet it is evident that the dustallaying means could be employed with a drillbody constructed of other material than as stated.

The drill besides the drilled axial bore 1, which extends from end to end thereof, comtion.

prises a body portion 2, terminating in aflaring end 3, having radially-extending cuttingteeth 4. The body portion also terminates in a boss .5, which acts as a stop when inserting the drill into the engine, and adjacent to said boss 5 a shoulder 6 is formed, which terminates in a shank end 7, which is inserted in one end of the engine, so that it will lie in the path of the hammer. The body portion 2 of the drill is provided with a flattened periphery, so that said body portion would be in cross-section square, septagonal, octagonal, &c., at certain parts of its length. The body portion 2 at certain parts of its length is cut away, so as to form a plurality of pairs of shoulders 7, 8, and 9. These shoulders are preferably formed by constructing a part of the body portion of the drill cylindrical in contour and of less diameter than the portions of the drill between. the pairs of shoulders. The pairs of shoulders 7 8 9 are adapted to retain upon the body portion 2 the adjustable abutment for the dust-catcher in a manner as hereinafter referred to. The adjustable abutment comprises a clamping portion 10, a handle portion 11, connected. with the clamping portion 1O, as at 12, and a pair of converging guides 13, which terminate in the clamping portion 10. The adjustable clamping-abutment is formed, preferably, of a single strip of spring metal bent upon itself in such a manner as to form the handle portion 11, connecting portion 12, the clamping portion 10, and converging guides 13. WVhen the clampingabutment is in position, the clamping portion 10 is adapted to surround the body portion of the drill between the shoulders of any pair of shoulders, as is illustrated in Figs. 5 and .6. The guides 13 materially assist the mounting of the adjustable clamping-abutment in posi- This is evidenced as when the adjustable clamping-abutme'nt is forced against the body portion between the shoulders of any pair of shoulders the guides 13 will be caused to spread apart, so that the clamping portion 10 will receive that portion of the drill between the shoulders of the pair of shoulders against which the guides have been forced.

The dust-catcher comprises a body of porous water-absorbing material, as indicated by the reference character 14:, and which prefer f' material 14, centrally thereof and not entirely therethrough, is a guide-sleeve 15, open from end to end and having its outer end provided with a flange 16, to which is riveted or otherwise secured thereto, as at 17, a strip of flexible material 18, which forms a coupling medium, and the said strip 18 has sewed or otherwise secured thereto, as at 19, the body of porous material 14:. The reason that the sleeve 15 does not extend entirely through the porous body is that it enables that portion of the porous body adjacent to the inner end of the sleeve to fit closely around the drill, thereby allowing no dust to blow through the tube, as the tube should be of such diameter as to not fit the drill closely, because it is necessary to adjust the sleeve to different points throughout the length thereof. Otherwise if the sleeve fit closely this adjustment could not be had. When the drill is used to drill upwardly, the body of porous material is dampened and is placed between the adjustable clamping-abutment and the cutting end of the drill, and when the drill is used to drill downwardly the porous body is placed against the adjustable clamping-abutment, which is interposed between the cutting end of the drill and the porous body. lVhen drilling downwardly, as the drill enters the rock and the porous body comes against the rock the adjustable clamping-abutment is moved back to between the shoulders of another pair of shoulders, and the porous body is then moved against the abutment. When drilling upwardly, when the adjustable clamping-abutment comes into contact with the rock the porous body is moved rearwardly and also the adjustable clamping-abutment, the adjustable clampingabutment being moved back to between the shoulders to another pair of shoulders.

It has been found that the dampened dusteatcher when in its operative position during the drilling operation catches or allays the dust orsmall particles of rock, so that they cannot fiy back against the face of the operator, and. also said dust-catcher prevents the by the operator when the drill is in use.

dust or particles of rock from being inhaled The dampened body of porous material is washed out about every half-hour or so.

Having thus fully described my invention,

what I claim as new, and desire to secure by Letters Patent, is-

l. A percussion-drill having mounted thereon an adjustable d ust-catcher, said d List-catcher comprising a porous body surrounding the drill, a sleeve extending partly through said porous body and surrounding the drill, and a coupling means for securing the porous body to the sleeve, combined with a single resilient adjustable member constituting an abutment adapted to frictionally clamp the drill and arrest the movement of the dust-catcher.

2. A hollow percussion-drill provided with a plurality of separate and independent pairs of peripheral shoulders.

3. The combination with a hollow percussion-drill and an adjustable porous body of water-absorbing material mounted upon the drill, of an adjustable abutment for said body, said abutment consisting of a single resilient member comprising a pair of guides, a concentric clamping portion and a handle and directly engaging the drill when in operative position.

4. A percussion-drill having mounted thereon, an adjustable dust-catcher consisting of a body of water-absorbing material having a portion thereof surrounding and engaging the drill, a sleeve mounted upon the drill, extendin g partly th rough said body and provided with an integral flange abutting against one end of the body, and an attaching means secured to the flange to which the said body is secured for connecting the latter to the sleeve.

In testimony whereof I have hereunto set my hand in presence of two subscribing witnesses.

JEREMIAH MURPHY. Vitnesses:

WM. A. SULLIVAN, J. S. GAY. 

